apartment

1especially American Englisha set of rooms on one floor of a large building, where someone lives [= flat British English]

She lives in a small apartment.

a holiday apartment

2 [usually plural]a room or set of rooms used by an important person such as a president:

I had never been in the prince's private apartments before.

the presidential apartments

WORD FOCUS: house WORD FOCUS: house types of house:terraced houseBritish English/row houseAmerican Englishone of several houses that are joined togetherdetached houseBritish Englisha house that is not joined to another housesemi-detached houseBritish Englisha house that is attached to another house on one sidecottagea small house in the countrybungalowBritish Englisha small house with one floorduplexAmerican Englisha house that is divided into two separate homesapartmentalsoflatBritish Englisha set of rooms where someone lives, which is part of a larger buildingcondominium/condoAmerican Englishan apartment in a large building, which is owned by the people who live therestudio apartment/studioalsobedsitBritish Englishan apartment with one main room and no separate bedrooma very large house:mansion, palace, country houseBritish English, stately homeBritish Englishsomeone who sells houses and land:estate agentBritish English, real estate agentAmerican English, realtorAmerican Englishsomeone who rents a house from another person:tenantsomeone who owns a house and rents it to people:landlord, landladyhouse➔ See alsohouse

Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.